KR100401612B1 - A method for registering a code in keys to prevent theft of vehicle - Google Patents

Abstract

The present invention relates to a method for registering an encryption key for preventing vehicle theft. The key registration method is a method for registering a vehicle anti-theft encryption key in a system including an engine control device for transmitting and receiving a start key and information through wireless communication, and a diagnostic device connected to the engine control device for performing diagnosis. The diagnostic device transmitting a vehicle password to the engine control device; Performing, by the engine controller, a set process for key registration; Storing, by the engine controller, the vehicle password; Changing, by the engine controller, its internal state data related to key registration; And transmitting, by the engine control apparatus, the vehicle password information generated by the vehicle password to the start key and storing the vehicle password information. According to the present invention, by performing the encryption code registration of the starter key in the diagnosis apparatus and the engine control apparatus without a separate authentication apparatus, information leakage due to communication hacking is difficult and security is improved.

Description

A METHOD FOR REGISTERING A CODE IN KEYS TO PREVENT THEFT OF VEHICLE}

The present invention relates to a vehicle anti-theft encryption key registration method, and more particularly, to a vehicle anti-theft encryption key registration method for performing the encryption code registration of the start key without a separate authentication device.

As is well known, the demand for the vehicle has increased as the vehicle has emerged as a representative means of position movement, and thus theft of the vehicle has also increased.

Accordingly, automakers have devised various methods to prevent theft of vehicles, and among them, the recent breakthroughs have been made by indexing a predetermined password to a ignition key, and starting when the engine is first released by recognizing the password. It allows you to start with just a key.

Conventionally, a semiconductor integrated circuit includes a key, an immobilizer device, an engine control device, and an antenna, and the immobilizer device determines whether a normal key is used, and confirms whether the key is normal by communicating between the immobilizer device and the engine control device. The engine control unit is configured to determine whether to allow the start. If the engine is not allowed to start, the fuel injection and ignition control are cut off, which makes the engine impossible to start, thereby fundamentally preventing the vehicle from moving.

However, in this case, it is determined whether the normal key is used using the immobilizer device, and the result of the determination is transmitted through communication with the engine control device to determine whether to start the engine, thereby allowing information leakage due to communication hacking.

Therefore, an object of the present invention is to solve the above-mentioned problems, and by performing the encryption code registration of the start key in the diagnostic device and the engine control device without a separate authentication device, it is difficult to leak information due to communication hacking An encryption key registration method for preventing theft of a vehicle is provided.

1 is a block diagram of a system in which a method for registering an encryption key for preventing vehicle theft according to an embodiment of the present invention is performed.

2 is a flowchart of a method for registering an encryption key for preventing vehicle theft according to an embodiment of the present invention.

As a means for achieving the above object, the present invention provides a vehicle anti-theft encryption in a system including an engine control device for transmitting and receiving the start key and information through wireless communication, and a diagnostic device connected to the engine control device for performing diagnosis. A method of registering a key, the diagnostic device comprising: transmitting a vehicle password to the engine control device; Performing, by the engine controller, a set process for key registration; Storing, by the engine controller, the vehicle password; Changing, by the engine controller, its internal state data related to key registration; And transmitting, by the engine control apparatus, the vehicle password information generated by the vehicle password to the start key and storing the vehicle password information.

The performing of the set process for key registration by the engine controller may include transmitting a vehicle password received from the diagnosis device to the diagnosis device when the key registration state is a virgin state in which the key registration is not registered. step; Comparing, by the diagnostic device, the vehicle password transmitted from the engine control device with the vehicle password transmitted in the previous step; And if the two vehicle passwords compared in the step are the same, transmitting a message confirming the start key registration to the engine controller.

The performing of the processor configured for key registration by the engine controller may include determining whether the state of the key is a virgin state when the key registration state is a learning state in which a key registration state is registered; Initializing, by the engine controller, its own internal state data related to key registration when the state of the key is in the virgin state; When the state of the key is a learning state in the step, comparing the vehicle password information received from the key with the vehicle password information stored therein by the engine control apparatus; And if the two vehicle password information compared in the step are the same, continuing the key registration operation.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a system in which a method for registering an encryption key for preventing vehicle theft according to an embodiment of the present invention is performed.

As shown in FIG. 1, the system includes a key 120 attached with a transponder 110 for decrypting an input cipher, calculating a cipher, and encrypting the computed signal; A key box 130 into which the key 120 is inserted and transmitting and receiving a signal to and from the key 120; It includes an engine control unit 150 for transmitting and receiving an encryption signal through the key box 130.

The coil box 140 is installed in the key box 130 to transmit / receive data to / from the transponder 110, and the engine control means 150 is connected to the coil antenna 140 via a data interface 160. Connect and send and receive data.

The diagnostic device 170 is connected to the engine control device 150 and operates as a master that performs encryption key registration for preventing vehicle theft, while the engine control device 150 operates as a slave.

The master diagnostic device 170 and the slave engine control device 150 communicate with each other via the data interface 160. In this case, a keyword 2000 protocol, which is an international communication standard, is used as the communication standard.

The diagnostic apparatus 170 includes a program that performs a method of registering an encryption key through communication with the engine control apparatus 150.

The transponder 110 of the key 120 is composed of an IC chip capable of encryption, decryption, and operation, and the engine control means 150 is a conventional electronic control unit (ECU) for controlling the engine.

In addition, the transponder 110 of the key 120 includes a memory for storing an encryption code, a vehicle password, and the like, for example, an EEPROM (Electrically Erasable Programmable Read Only Memory).

Hereinafter, an operation of the vehicle anti-theft encryption key registration method according to an embodiment of the present invention will be described with reference to FIG. 2.

First, the diagnostic apparatus 170 transmits a communication start request message to the engine controller 150 to start communication with the engine controller 150 (S10).

The engine controller 150 analyzes the communication start request message received from the diagnostic device 170 and transmits an affirmative response message for the communication start request to the diagnostic device 170 when there is no defect, thereby communicating between the two devices. This can be started (S20).

At this time, when the communication start request message reception error occurs in the engine controller 150, since the communication cannot be performed, the engine controller 150 does not perform communication through a process such as sending a negative response message. do.

On the other hand, the diagnostic device 170 receiving the positive response message transmits the immobilizer communication request message to the engine control device 150 (S30), the engine control device 150 as described above, the diagnostic device 170 (S40).

In this case, the immobilizer communication request message includes a code for communication speed information of a specific reference communication speed, for example, 10.4 kbps, so that the communication speed between the diagnostic device 170 and the engine controller 150 may be adjusted if necessary. It can be changed and used.

Next, if an affirmative response is sent to the immobilizer communication request message, the encryption key registration process may be performed, and the user inserts the key 120 to register the encryption code into the key box 130 (S42). 120 is located at the ignition on (S44).

On the other hand, the engine controller 150 determines whether the key state is the ignition on state (S50), and waits until the ignition on state if not the ignition on state.

If the key state is the ignition on state, the engine controller 150 transmits a message requesting the memory state data of the key 120 to the key 120 through the antenna 140 connected to the data interface 160. (S60).

The key 120 receives the memory state data request message from the engine controller 150, and then transmits the key state data stored in the corresponding memory to the engine controller 150 (S70), and the engine controller 150 transmits the key state data to the engine controller 150. The key memory state data received from the key 120 is temporarily stored in the internal memory (S80).

On the other hand, the diagnostic device 170 transmits a message requesting the state data of the engine controller 150 to the engine controller 150 for key registration (S90).

The state of the start key registration of the engine controller 150 may be a virgin state in which an initial key is not registered and a learning state in which one or more start keys are registered, depending on whether a key is registered. The ignition key is registered.

Therefore, the engine controller 150 transmits the state data stored in the internal memory to the diagnosis apparatus 170 (S100).

Next, the diagnostic apparatus 170 transmits the vehicle password to be recorded in the start key in the message to the engine controller 150 (S110).

The engine controller 150 determines whether the start key registration state is a virgin state (S120), and if it is a virgin state, the engine control unit 150 again checks the accuracy of the vehicle password received from the diagnosis apparatus 170. To transmit (S130).

The diagnosis apparatus 170 compares the vehicle password received from the engine controller 150 with the vehicle password previously transmitted (S140), and determines whether or not it is the same (S150).

If the two vehicle passwords are not the same, the key registration process ends, and if the two vehicle passwords are the same, a message for confirming the start key registration is transmitted to the engine controller 150 (S160).

Next, the engine controller 150 stores the received vehicle password and key state data in the internal memory (S170), changes the internal key registration state to the learning state, and increases the number of learned keys by one (S180). .

Thereafter, the vehicle password information is transmitted to the start key 120 (S190), and the start key 120 stores the received vehicle password information in the internal memory (S200). In this case, the vehicle password information includes an authentication identifier and a key password generated using the vehicle password received from the diagnostic apparatus 170.

When storing the vehicle password in the ignition key 120 is completed, the engine controller 150 transmits a message indicating that the key registration is completed to the diagnosis apparatus 170 (S210), and the diagnosis apparatus 170 registers a new key by the user. After determining whether to perform (S220), if there is no new key registration, the registration of the encryption code of the start-up key is terminated, and if it is determined to continue to perform the new key registration operation from the steps (S50, S42) Continue.

At this time, the registration of the new key is possible up to four, and can be started after the new key is inserted into the key box 130 and placed in the ignition on position.

On the other hand, when the internal state of the engine controller 150 is a learning state instead of the virgin state in the step (S120), the engine controller 150 determines whether the key state is a virgin state (S230).

If the key state is the virgin state, the engine controller 150 initializes the learned key state data, the number of learned keys, internal state data of the engine control apparatus, and the like (S240), and the step (S170). Continue from here.

In addition, when the key state is not the virgin state but the learning state, the engine controller 150 compares the vehicle password information received from the key 120 with the vehicle password information stored in the internal memory (S250), and whether or not it is the same. Determine (S260).

If the two pieces of information are not the same, the key registration process is terminated. If the two pieces of information are the same, the process continues from step S170.

Although the present invention has been described with reference to the most practical and preferred embodiments, the present invention is not limited to the above disclosed embodiments, but also includes various modifications and equivalents within the scope of the following claims.

According to the present invention, by performing the encryption code registration of the starter key in the diagnosis apparatus and the engine control apparatus without a separate authentication apparatus, information leakage due to communication hacking is difficult and security is improved.

Claims (4)

In the system comprising an engine control device for transmitting and receiving the start key and information via wireless communication, a diagnostic device connected to the engine control device for performing a diagnosis, the method for registering a vehicle anti-theft encryption key, The diagnostic device transmitting a vehicle password to the engine control device; Performing, by the engine controller, a set process for key registration; Storing, by the engine controller, the vehicle password; Changing, by the engine controller, its internal state data related to key registration; And The engine control unit transmitting and storing vehicle password information generated by the vehicle password as the start key; Vehicle anti-theft encryption key registration method comprising a. The method of claim 1, The step of performing the set process for registering the key by the engine control unit When the key registration state is a virgin state in which key registration is not performed, transmitting a vehicle password received from the diagnosis device to the diagnosis device; Comparing, by the diagnostic device, the vehicle password transmitted from the engine control device with the vehicle password transmitted in the previous step; And If the two vehicle passwords compared in the step are the same, transmitting a message confirming the start key registration to the engine controller; Vehicle anti-theft encryption key registration method comprising a. The method of claim 1, The step of performing the set process for registering the key by the engine control unit Determining whether the key state is a virgin state when the key registration state is a learning state in which a key registration state is registered; Initializing, by the engine controller, its own internal state data related to key registration when the state of the key is in the virgin state; When the state of the key is a learning state in the step, comparing the vehicle password information received from the key with the vehicle password information stored therein by the engine control apparatus; And If the two vehicle password information compared in the above step is the same, continuing the key registration operation Vehicle anti-theft encryption key registration method comprising a. The method of claim 1, And the vehicle password information includes an authentication identifier generated using the vehicle password and a key password.